Offset printing machine



FIG. 1 is a front, and right side perspective view of an offset printing machine showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a left side elevational view thereof. The bottom is unadorned. 

The ornamental design for an offset printing machine, as shown and described. 